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A contour line joins locations having the same height above the mean sea level. The following is a contour plot of a geographical region. Contour lines are shown at 25 m intervals in this plot. The path from P to Q is best described by 

A contour line joins locations having the same height above the mean sea level. The following is a contour plot of a geographical region. Contour lines are shown at 25 m intervals in this plot. The path from P to Q is best described by  Correct Answer Down-Up-Down

During the first path

550 → 525→500→ 475

The movement is downward

[ alt="GATE 2017 EC SHIFT 1 APTI images nita Q10a" src="//storage.googleapis.com/tb-img/production/19/06/GATE%202017%20EC%20SHIFT%201%20APTI%20_images_nita_Q10a.PNG" style="width: 395px; height: 221px;">

During the second path

475 → 500 → 525 → 550

The movement is upwards

[ alt="GATE 2017 EC SHIFT 1 APTI images nita Q10b" src="//storage.googleapis.com/tb-img/production/19/06/GATE%202017%20EC%20SHIFT%201%20APTI%20_images_nita_Q10b.PNG" style="width: 393px; height: 220px;">

The last path

575 → 550

Path is down

[ alt="GATE 2017 EC SHIFT 1 APTI images nita Q10c" src="//storage.googleapis.com/tb-img/production/19/06/GATE%202017%20EC%20SHIFT%201%20APTI%20_images_nita_Q10c.PNG" style="width: 394px; height: 220px;">

Total path movement from P to Q is

Down → Up → Down

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